ONIOM

The ONIOM (short for 'Our own N-layered Integrated molecular Orbital and Molecular mechanics'[1]) method is a computational approach developed by Keiji Morokuma and co-workers. ONIOM is a hybrid method that enables different ab initio, semi-empirical, or molecular mechanics methods to be applied to different parts of a molecule/system in combination to produce reliable geometry and energy at reduced computational cost.[2][3][4] The ONIOM computational approach has been found to be particularly useful for modeling biomolecular systems[5] as well as for transition metal complexes and catalysts.[6]

## Contents

* 1 Codes that support ONIOM
* 2 See also
* 3 External links
* 4 References

## Codes that support ONIOM

* Gaussian
* NWChem
* ORCA (quantum chemistry program)

## See also

* QM/MM
* Steric effects (ONIOM to separate Steric effects vs. electronic effects)

## External links

* Morokuma Group Home Page

## References

1. ↑ "Investigating the Reactivity and Spectra of Large Molecules with ONIOM | Gaussian.com". https://gaussian.com/oniom_technote/.
2. ↑ S. Dapprich; I. Komaromi; K.S. Byun; K. Morokuma; M.J. Frisch (1999). "A new ONIOM implementation in Gaussian98. Part I. The calculation of energies, gradients, vibrational frequencies and electric field derivatives". Journal of Molecular Structure: THEOCHEM 461-462: 1–21. doi:10.1016/S0166-1280(98)00475-8.
3. ↑ Vreven, T; Morokuma, K (2006). "Chapter 3 Hybrid Methods: ONIOM(QM:MM) and QM/MM". Annual Reports in Computational Chemistry 2: 35–51. doi:10.1016/S1574-1400(06)02003-2. ISBN 9780444528223.
4. ↑ Svensson, Mats; Humbel, StéPhane; Froese, Robert D. J.; Matsubara, Toshiaki; Sieber, Stefan; Morokuma, Keiji (1996). "ONIOM: A Multilayered Integrated MO + MM Method for Geometry Optimizations and Single Point Energy Predictions. A Test for Diels−Alder Reactions and Pt(P(t-Bu)3)2+ H2Oxidative Addition". The Journal of Physical Chemistry 100 (50): 19357. doi:10.1021/jp962071j.
5. ↑ Senn, H; Thiel, W (2007). "QM/MM studies of enzymes". Current Opinion in Chemical Biology 11 (2): 182–7. doi:10.1016/j.cbpa.2007.01.684. PMID 17307018.
6. ↑ Ananikov, Valentine P.; Musaev, Djamaladdin G.; Morokuma, Keiji (2010). "Real size of ligands, reactants and catalysts: Studies of structure, reactivity and selectivity by ONIOM and other hybrid computational approaches☆". Journal of Molecular Catalysis A: Chemical 324 (1–2): 104–119. doi:10.1016/j.molcata.2010.03.015.

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